>>21873376German here, I bought a mask and body suit at Simon-O. The masks don't have a super long neck, so I would recommend a collar to fill the gap between suit and mask. Quality seems to be nice and price is ok with their basic line.
I'm very muscular so the body doesn't fit me so well, but it's good enough.
Sadly I don't have many occassions to wear the stuff, but would recommend Simon-O in general. Except their "fast shipping" is absolutly unecessary.